A very smart person once said the key to practically create value is to know your output, and then define and control its relevant inputs. This is a different way of saying achieving anything requires intelligent movement in its direction.
The value, or purpose, is usually clear. And starting as simple as possible tends to give an equally clear sense of its inputs, or what needs to be done. Like a tasklist or a to-do list. The challenge is in doing, and in continously doing things better over time.
Doing things well tends to depend on imagination, time, and experience. But doing them better requires a committment to understanding, controlling, and improving. It requires a practical system for an improvement mindset, and this is what Phi is.